87921670838 has 16 divisors (see below), whose sum is σ = 136968783840. Its totient is φ = 42292109376.

The previous prime is 87921670717. The next prime is 87921670841. The reversal of 87921670838 is 83807612978.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6668306 + ... + 6681477.

It is an arithmetic number, because the mean of its divisors is an integer number (8560548990).

Almost surely, 2^87921670838 is an apocalyptic number.

87921670838 is a deficient number, since it is larger than the sum of its proper divisors (49047113002).

87921670838 is a wasteful number, since it uses less digits than its factorization.

87921670838 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13349911.

The product of its (nonzero) digits is 8128512, while the sum is 59.

The spelling of 87921670838 in words is "eighty-seven billion, nine hundred twenty-one million, six hundred seventy thousand, eight hundred thirty-eight".